Kingdom Protista (Haeckel, 1866) - protists Phylum Sarcomastigophora Honigberg & Balamuth, 1963 Subphylum Mastigophora Diesing, 1866 - flagellates Class Phytomastigophorea Calkins, 1909 - photosynthetic flagellates Order Volvocida Francé, 1894, orth. zool. - volvocids see Order Chlamydomonadales F.E. Fritsch Genus Gonium O.F.Müll. (1773)